137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
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/* Here is stuff for interfacing to directories.
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** Copyright (c) 1993, 1994 by Olin Shivers.
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libcig.h"
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#include "scsh_aux.h"
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extern int errno;
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/* Linked list of malloc'd entries. */
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struct scm_dirent_struct
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{ char *fname; /* File name */
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struct scm_dirent_struct *next;}; /* Next pointer */
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typedef struct scm_dirent_struct scm_dirent_t;
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void free_dirent_list(scm_dirent_t *entry)
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{
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while(entry) {
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scm_dirent_t *next = entry->next;
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Free(entry);
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entry = next;
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}
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}
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/* Returns [err, fnames, len]
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** err is 0 for success, otw errno.
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** fnames is a vector of strings (filenames), null terminated.
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** len is the length of fnames.
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*/
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int open_dir(char *dirname, char ***fnames, int *len)
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{
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scm_dirent_t *dep, *entries;
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struct dirent *dirent;
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char *fname, **dirvec, **vecp;
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DIR *d;
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int num_entries;
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int e; /* errno temp */
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if( NULL == (d = opendir(dirname)) ) return errno;
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entries = NULL; num_entries = 0;
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while( NULL != (dirent = readdir(d)) ) {
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if((strcmp(dirent->d_name,".") == 0) || (strcmp(dirent->d_name,"..") == 0))
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continue;
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if( NULL == (dep=Alloc(scm_dirent_t)) )
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{e=errno; goto lose2;}
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if( NULL == (fname=copystring(NULL, dirent->d_name)) ) goto lose1;
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dep->fname = fname;
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dep->next = entries;
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entries = dep; num_entries++;
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}
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closedir(d);
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/* Load the filenames into a vector and free the structs. */
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if( NULL == (dirvec = Malloc(char *, num_entries+1)) )
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{e=errno; goto lose3;}
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for(dep=entries, vecp=dirvec; dep; vecp++) {
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scm_dirent_t *next = dep->next;
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*vecp = dep->fname;
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Free(dep);
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dep = next;
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}
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dirvec[num_entries] = NULL;
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*fnames = dirvec;
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*len = num_entries;
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return 0;
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lose1: e = errno; Free(dep);
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lose2: closedir(d);
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lose3: free_dirent_list(entries);
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return e;
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}
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#define DOTFILE(a) ((a) && *(a) == '.') /* Not a function. */
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/* a <= b in the Unix filename ordering:
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** dotfiles come first, lexicographically ordered.
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** others come second, lexicographically ordered.
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**
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** This is for sorting filenames in directory listings.
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*/
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static int compare_fname(const void *aptr, const void *bptr)
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{
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char *a= *(char**)aptr, *b = *(char**)bptr;
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if( DOTFILE(a) )
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return DOTFILE(b) ? strcmp(a+1,b+1) : -1;
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return DOTFILE(b) ? 1 : strcmp(a,b);
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}
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void scm_sort_filevec(char **dirvec, int nelts)
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{
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qsort((char *) dirvec, nelts, sizeof(char*), compare_fname);
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}
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#if 0
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/* This one is a little more complex, but we don't use it because we
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** never try to sort lists of filenames with . or .. in the list.
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*/
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/* Boolean function: a <= b in the Unix filename ordering:
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** . comes first
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** .. comes second
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** Other dotfiles come next, lexicographically ordered.
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** Non-dotfiles come last, lexicographically ordered.
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**
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** This is for sorting filenames in directory listings.
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*/
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static int comp1(const void *aptr, const void* bptr)
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{
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char *a = *(char**)aptr, *b = *(char**)bptr;
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if(streq(a,b)) return 0;
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if(DOTFILE(a))
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if( DOTFILE(b) )
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return streq(a, ".") ||
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(!streq(b, ".") && (streq(a, "..") || (!streq(b, "..") &&
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(strcmp(a,b) <= 0))))
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? -1 : 1;
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else return -1;
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else return DOTFILE(b) ? 1 : strcmp(a,b);
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}
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#endif
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